No module named 'cert_core'

I have installed cert-verifier by cloning from Github and using pip3 (I have got Python3). I didn’t receive any error msg during the installation process.
However when I run “py” it gives me the following error msg:

Traceback (most recent call last):
File “”, line 14, in
from cert_core import to_certificate_model
ModuleNotFoundError: No module named ‘cert_core’

Could someone help?

Try python 2. It is working for us with Python2